List of most-disliked YouTube videos

This list of most-disliked YouTube videos contains the top 42 videos with the most dislikes as of December 12, 2021, as derived from the American video platform, YouTube's, charts. The dislike count was taken directly from the page of the video itself. YouTube implemented a like and dislike button on video pages from 2010 as part of a major site redesign. The feature served as a replacement for the previous five-star rating system, which was found to be ineffective because of the rare selection of ratings from two to four stars. Of the 42 videos in this list, 6 also appear in the list of most-viewed YouTube videos and 4 appear in the list of most-liked YouTube videos. Note that the dislike count does not indicate the true unpopularity of a video, which is better represented by dislike percentage, also provided in the table. For instance "Despacito", "Baby Shark Dance", and "Gangnam Style" all appear on this list, but also appear in the list of most-liked YouTube videos. As of December 2021, Cocomelon – Nursery Rhymes has the most videos in the top 50 with thirteen, while YouTube and Jingle Toons have two.

On December 13, 2018, YouTube Rewind 2018: Everyone Controls Rewind became the most disliked video on the video sharing platform with 15 million dislikes, rapidly surpassing the music video for Justin Bieber's song "Baby", which previously entered the Guinness World Records book as the most disliked video on YouTube and on the Internet. As of July 9, 2021, YouTube Rewind 2018 has over 7.1 million more dislikes than Justin Bieber's Baby.

In March 2011, "Baby", which then had 1.17 million dislikes, was surpassed by the video for Rebecca Black's "Friday", yielding more than 1.2 million dislikes. "Friday" amassed over three million dislikes before the video was taken down in June 2011. The video was reinstated three months later and has not been taken down since.